AAC no longer direct plays on Roku OS 10?

The Preview App for Roku contains a fix (work-around) for this issue:

I run the Preview App exclusively. A Roku Private Channel isn’t listed in the guide, but can be updated in moments. It doesn’t need to endure the Roku App Approval Sequence and contains all the goodies to be the best there is at any given time.

I uninstalled the Official App some time ago.
It’s in the Guide if I ever need it.
Can’t imagine why I would.

You can Track that thread and when you see an update happened, update your system and get it - or your box will when it checks for an update every day. Easy.